Friction ring for a motorcycle brake disc



FIG. 1 is a perspective view showing the front, top and left side of a friction ring for a motorcycle brake disc which forms my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a left side elevational view thereof. 

CLAIM The ornamental design for a friction ring for a motorcycle brake disc, as shown and described. 